Off-grid single-phase cascaded photovoltaic energy storage hybrid system and control method thereof

A hybrid system and photovoltaic energy storage technology, which is applied in photovoltaic power generation, energy storage, AC network load balancing, etc., can solve the problems of static error and large harmonic content of off-grid voltage, so as to improve stability and reduce harmonic content , The effect of wide stable working range

Inactive Publication Date: 2020-07-03
江苏南自通华智慧能源股份有限公司 +1
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Problems solved by technology

[0003] In the existing research, the research on the off-grid control strategy of the optical-storage hybrid system mainly focuses on the improvement and promotion of the voltage-type control strategy. The off-grid voltage generated by this method often has a large harmonic content, and there is a certain static error.

Method used

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  • Off-grid single-phase cascaded photovoltaic energy storage hybrid system and control method thereof
  • Off-grid single-phase cascaded photovoltaic energy storage hybrid system and control method thereof
  • Off-grid single-phase cascaded photovoltaic energy storage hybrid system and control method thereof

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Embodiment

[0049] Using MATLAB / Simulink simulation to verify the proposed off-grid control method, build the above-mentioned cascaded system of a photovoltaic unit and a storage battery, the electrical load is selected as a resistive load, and according to figure 2 The control block diagram shown is to build a control system for simulation. The specific simulation parameters are set as: energy storage inverter DC side voltage V bat =100V, resistive load R=10Ω, filter inductance L=0.0225H, grid frequency f=50Hz, voltage stabilizing capacitor C=00021F, temperature T=25°C, initial light intensity of 1000W / m 2 , the maximum power voltage V of photovoltaic cells pvmppt =60V, off-grid voltage u out，ref The amplitude is 100V and the phase is 0°.

[0050] In the simulation test, the simulation of illumination changes was carried out. When the simulation runs to 3s, the illumination intensity of photovoltaic cells has changed, from the initial illumination intensity of 1000W / m 2 Reduced to 8...

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Abstract

The invention discloses an off-grid single-phase cascade photovoltaic energy storage hybrid system and a control method thereof. The system comprises a photovoltaic inverter, an energy storage inverter and an off-grid load, wherein the off-grid load comprises a filter inductor L and an electricity load R. According to the method, a photovoltaic cell is ensured to work in a maximum power state through a photovoltaic inverter control module, and photovoltaic output power is controlled to be completely converted into active power; an energy storage inverter control module controls an energy storage battery to cooperate with the photovoltaic cell to discharge so as to ensure the stability of the off-grid output voltage of the hybrid system; compared with the traditional modulation method, carrier phase shift modulation in the cascade system can effectively reduce the voltage harmonic content and output a voltage waveform with high quality; and different from the traditional photovoltaic energy storage hybrid system, the off-grid control method based on the cascaded photovoltaic energy storage hybrid system provided by the invention can effectively reduce the harmonic content of the output voltage and ensure the off-grid power supply quality, and the control method is simple and easy to implement and has good practicability.

Description

technical field [0001] The invention relates to photovoltaic power generation technology, in particular to an off-grid single-phase cascaded photovoltaic energy storage hybrid system and a control method thereof. Background technique [0002] In the photovoltaic power generation system, the cascaded photovoltaic energy storage hybrid system is a superior integrated topology, which has many advantages: it can stabilize photovoltaic power fluctuations, low switching frequency, has a wide range of reactive power compensation and can realize photovoltaic panels and Battery independent maintenance and control, etc. [0003] In the existing research, the research on the off-grid control strategy of the optical-storage hybrid system mainly focuses on the improvement and promotion of the voltage-type control strategy. The off-grid voltage generated by this method often has a large harmonic content and has certain static errors. However, the optical-storage hybrid system using a cas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/01
CPCH02J3/01H02J3/32Y02E10/56Y02E40/40Y02E70/30
Inventor 刘钊徐魁叶曙光汪斌邓海波
Owner 江苏南自通华智慧能源股份有限公司
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